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Updated: Jan 27, 2026
2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
Published on: June 22, 2013
Background:
Loss of the Pten (phosphatase and tensin homolog) gene has been demonstrated to result in hyperactivation of the mammalian target of rapamycin (mTOR) pathway, a signaling pathway common to many disease etiologies, including tuberous sclerosis complex, Fragile X syndrome, and schizophrenia. Previous studies have focused on the impact of hyperactivation of the mTOR pathway in hippocampus and cortex and behaviors among those structures, but little is known about the relationship of Pten and mTOR signaling in the development and function of the cerebellum.
Objective:
The purpose of this investigation was to examine cerebellar levels of several molecular signaling pathways, including PI3K/AKT/mTOR signaling and markers of neuronal migration, following loss of Pten in a subset of neurons, as well as the accompanying behavior phenotype.
Methods:
Motor coordination and learning was measured by the sticker removal task, the accelerating rotarod, and spontaneous activity in a cylinder. Western blots were conducted on cerebellar tissue samples.
Results:
We demonstrated that neuron-specific deletion of Pten (NS-Pten) in mice led to deficits in motor coordination. These changes were accompanied by alterations in many different proteins, including the PI3K/AKT/mTOR signaling pathway, FMRP, glutamate receptors and neuronal migration markers.
Conclusions:
These data firstly support a role for hyperactivation of mTOR in the cerebellum following loss of Pten, accompanied by behavioral deficits. Moreover, the results of the current study support a broader role for Pten signaling in early neuronal migration and organization of the cerebellum, and point to a putative role for Pten for many neuropsychiatric conditions.
Insights
Loss of the Pten gene in mice caused motor coordination deficits due to mammalian target of rapamycin (mTOR) pathway hyperactivation in the cerebellum. This study highlights Pten
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Loss of the Pten (phosphatase and tensin homolog) gene leads to mammalian target of rapamycin (mTOR) pathway hyperactivation.
- The mTOR pathway is implicated in various neurological disorders.
- The role of Pten and mTOR signaling in cerebellar development and function is largely unknown.
Purpose of the Study:
- To investigate cerebellar molecular signaling pathways, including PI3K/AKT/mTOR, following Pten loss in specific neurons.
- To examine markers of neuronal migration and the associated behavioral phenotype.
- To understand the impact of Pten deletion on cerebellar development and function.
Main Methods:
- Utilized the sticker removal task, accelerating rotarod, and spontaneous activity tests to assess motor coordination and learning.
- Conducted Western blot analyses on cerebellar tissue samples.
- Employed neuron-specific deletion of Pten (NS-Pten) in a mouse model.
Main Results:
- Neuron-specific deletion of Pten (NS-Pten) resulted in impaired motor coordination in mice.
- Observed alterations in the PI3K/AKT/mTOR signaling pathway, FMRP, glutamate receptors, and neuronal migration markers.
- Demonstrated a link between Pten loss, mTOR hyperactivation, and motor deficits.
Conclusions:
- Hyperactivation of mTOR in the cerebellum, following Pten loss, is associated with behavioral deficits.
- Pten signaling plays a crucial role in early cerebellar neuronal migration and organization.
- These findings suggest a potential role for Pten in various neuropsychiatric conditions.
